heirs and assigns, forever

[SillyMystery]

Okay where to start..... My grandparents owned 15 acres of land and got a divorce in 1980. They had a big problem settling up how to divide the land... in the end 1 acre and the house went to my grandmother for a life time estate and 14 acres went to my grandfather for a life time estate. Which ever passed first got a life time estate on the others acres. Anyway then it was to my mom and my uncle.. (but my uncle has now also passed away). What I am trying to figure out is in the deed it says "To have and to hold the said tract or parcel of land, with all and singular the rights, members and appurtenances thereof, to the same being, belonging, or in anywise appertaining, to only proper use, benefit and behoof of the said parties of the second part, their heirs and assigns, forever, in Fee Simple. AND the said parties of the first part, their heirs, executers and administrators, will warrant and forever defend the right and title to the above described property, unto the said parties of the second part, their heirs and assigns, against the claims of all persons whomsoever." What does this mean? does the property go to my moms and uncles children at their passing? Can someone explain this to me? Thank you.